This one is unique simply because of the ornamentation......two angel heads on each corner, wings outspread, with an arch and pillars over the epitaph; it has a flower (possibly a poppy) in the center. Most likely made of red sandstone, it has some lichen on it.  The epitaph reads:

"In Memory
of Dan Robinfon
Son of Mr Ebenezer
and Mrs Elizabeth
Robinfon he Died
August 28 1765 in
ye 29th year of his Age."
 (note the long f--what is now "s" today.)

There is more writing below, but too worn to read.